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Discover LudwigThe phrase "a submarine" is correct and usable in written English.
It can be used when referring to a type of watercraft designed to operate underwater.
Example: "The navy deployed a submarine to conduct surveillance in the region."
Alternatives: "a submersible" or "an underwater vessel".
Exact(59)
A submarine to Mars?
It was a submarine.
Not counting a submarine.
One possibility is a submarine landslide.
"We will be making a submarine car.
"Like the ping from a submarine".
A submarine was beeshlóó' iron fish.
A submarine museum is at Ramakrishna Beach.
THE SCREEN; A Submarine Drama.
Journalist mysteriously vanishes aboard a submarine.
Similar(1)
and miles away/ if we had a submarine/.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com